Build Rust extensions on demand in source checkouts (#34994)

rust/sglang-grpc/Cargo.toml

@@ -8,7 +8,7 @@ license.workspace = true
 # Consumed by python/setup.py: registers this crate as a PyO3 extension module
 # of the main sglang wheel at the given import path.
 [package.metadata.sglang]
-python-module = "sglang.srt.grpc._core"
+python-module = "sglang.srt.rust_extensions._grpc"
 # Always build optimized, even for an editable install.
 debug = false
 

rust/sglang-grpc/pyproject.toml

@@ -1,7 +1,7 @@
 # Standalone dev builds only (`maturin build` / `maturin develop`); the
 # extension ships to users inside the main sglang wheel via setuptools-rust
-# (python/pyproject.toml, target sglang.srt.grpc._core). Requires a repo
-# checkout (build.rs reads ../../proto), so this is not publishable as an
+# (python/pyproject.toml, target sglang.srt.rust_extensions._grpc). Requires a
+# repo checkout (build.rs reads ../../proto), so this is not publishable as an
 # sdist. protoc is not required: build.rs falls back to a vendored binary.
 [build-system]
 requires = ["maturin>=1.5,<2"]
@@ -14,4 +14,4 @@ description = "In-process Rust gRPC server for SGLang"
 requires-python = ">=3.10"
 
 [tool.maturin]
-module-name = "_core"
+module-name = "_grpc"

rust/sglang-grpc/src/lib.rs

@@ -257,7 +257,7 @@ fn start_server(
 }
 
 #[pymodule]
-fn _core(m: &Bound<'_, PyModule>) -> PyResult<()> {
+fn _grpc(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(start_server, m)?)?;
     m.add_class::<GrpcServerHandle>()?;
     m.add_class::<ChunkSendStatus>()?;